<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/utils.js"></script>
<meta name="timeout" content="long">
<body>
<script>
function runTest(test_file, expectation, description) {
  promise_test(async t => {
    const bc = new BroadcastChannel('prerender-channel');
    t.add_cleanup(_ => bc.close());

    const gotMessage = new Promise(resolve => {
      bc.addEventListener('message', e => {
        resolve(e.data);
      }, {
        once: true
      });
    });

    // Open a new window to test the message box.
    window.open(test_file, '_blank', 'noopener');

    // Wait for the message from the prerendering page.
    assert_equals(await gotMessage, expectation);
  }, description);
}

// Test that a page invokes the alert modal during prerendering.
runTest(
    'resources/message-boxes.html?alert',
    'no block',
    'alert() does not display the modal and returns immediately');

// Test that a page invokes the comfirm modal during prerendering.
runTest(
    'resources/message-boxes.html?confirm',
    'the return value is no',
    'comfirm() does not display the modal and returns immediately');

// Test that a page invokes the prompt modal during prerendering.
runTest(
    'resources/message-boxes.html?prompt',
    'the return value is null',
    'prompt() does not display the modal and returns immediately');
</script>
</body>
